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authorPaul Mundt <lethal@linux-sh.org>2010-10-14 03:04:44 +0900
committerPaul Mundt <lethal@linux-sh.org>2010-10-14 03:04:44 +0900
commit47da88f36639b8de57f6cdd680f8c27528ccd67c (patch)
tree2c5cf30f6fb84366277fcbec57a0c8cc04f64282 /arch/sh/boards/mach-sdk7786
parent550a1ef18a53cae3d908edceca9daaafbedcf12f (diff)
sh: mach-sdk7786: Add support for fpga gpios.
The sdk7786 FPGA supports a number of user settable input switches that are otherwise unused. This wires up a dummy gpio chip for the switch bank to simply expose them to userspace. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/boards/mach-sdk7786')
-rw-r--r--arch/sh/boards/mach-sdk7786/Makefile2
-rw-r--r--arch/sh/boards/mach-sdk7786/gpio.c49
2 files changed, 51 insertions, 0 deletions
diff --git a/arch/sh/boards/mach-sdk7786/Makefile b/arch/sh/boards/mach-sdk7786/Makefile
index a29f19e85b6..d0f801bd841 100644
--- a/arch/sh/boards/mach-sdk7786/Makefile
+++ b/arch/sh/boards/mach-sdk7786/Makefile
@@ -1 +1,3 @@
obj-y := setup.o fpga.o irq.o
+
+obj-$(CONFIG_GENERIC_GPIO) += gpio.o
diff --git a/arch/sh/boards/mach-sdk7786/gpio.c b/arch/sh/boards/mach-sdk7786/gpio.c
new file mode 100644
index 00000000000..f71ce09d4e1
--- /dev/null
+++ b/arch/sh/boards/mach-sdk7786/gpio.c
@@ -0,0 +1,49 @@
+/*
+ * SDK7786 FPGA USRGPIR Support.
+ *
+ * Copyright (C) 2010 Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/io.h>
+#include <mach/fpga.h>
+
+#define NR_FPGA_GPIOS 8
+
+static const char *usrgpir_gpio_names[NR_FPGA_GPIOS] = {
+ "in0", "in1", "in2", "in3", "in4", "in5", "in6", "in7",
+};
+
+static int usrgpir_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
+{
+ /* always in */
+ return 0;
+}
+
+static int usrgpir_gpio_get(struct gpio_chip *chip, unsigned gpio)
+{
+ return !!(fpga_read_reg(USRGPIR) & (1 << gpio));
+}
+
+static struct gpio_chip usrgpir_gpio_chip = {
+ .label = "sdk7786-fpga",
+ .names = usrgpir_gpio_names,
+ .direction_input = usrgpir_gpio_direction_input,
+ .get = usrgpir_gpio_get,
+ .base = -1, /* don't care */
+ .ngpio = NR_FPGA_GPIOS,
+};
+
+static int __init usrgpir_gpio_setup(void)
+{
+ return gpiochip_add(&usrgpir_gpio_chip);
+}
+device_initcall(usrgpir_gpio_setup);